TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2154/54

DTC Code DTC Name
C2154/54 Initiator Driver Circuit (Open)

DESCRIPTION

The tire pressure warning ECU and receiver and the tire pressure monitor initiator driver communicate via a direct communication line. When an open circuit between the tire pressure warning ECU and receiver and the tire pressure monitor initiator driver is detected, DTC C2154/54 is stored.

DTC No. DTC Detection Condition Trouble Area
C2154/54 There is an open circuit between the tire pressure monitor initiator driver and the tire pressure warning ECU and receiver and the vehicle is driven at a speed of 8 km/h (5 mph) or more for a total of 30 seconds.

  • Tire pressure monitor initiator driver

  • Wire harness or connector

  • Tire pressure warning ECU and receiver

WIRING DIAGRAM

A01G5HYE01

INSPECTION PROCEDURE

Note


  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the GTS and write them down before removal.

  • It is necessary to perform initialization Click here after registration Click here of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR INITIATOR DRIVER IG VOLTAGE)


    1. A01G4R7E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Tire Pressure Monitor Initiator Driver)

      Turn the engine switch off.

    2. Disconnect the H79 tire pressure monitor initiator driver connector.

    3. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H79-8 (IG) - Body ground Engine switch on (IG) 10 to 16 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      H79-5 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR INITIATOR DRIVER - TIRE PRESSURE WARNING ECU AND RECEIVER)


    1. Turn the engine switch off.

    2. Disconnect the H79 tire pressure monitor initiator driver connector.

    3. Disconnect the P29 or P25 tire pressure warning ECU and receiver connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for FMVSS138 Type
      Tester Connection Condition Specified Condition
      H79-6 (SIL) - P29-8 (ALSI) Always Below 1 Ω
      H79-6 (SIL) - Body ground Always 10 kΩ or higher
      for ECE-R64 Type
      Tester Connection Condition Specified Condition
      H79-6 (SIL) - P25-8 (ALSI) Always Below 1 Ω
      H79-6 (SIL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK WAVEFORM


    1. A01G8Z5E03
      Text in Illustration
      *a

      Component with harness connected

      (Tire Pressure Monitor Initiator Driver)
      *b Example
      *c GND

      Connect the H79 tire pressure monitor initiator driver connector.

    2. Using an oscilloscope, check the waveform.

      Waveform
      Item Contents
      Terminal H79-6 (SIL) - H79-5 (GND)
      Tool setting 5 V/DIV, 5 ms./DIV.
      Vehicle condition Engine switch on (IG)

      Tech Tips

      The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the tire pressure warning ECU and receiver can be considered to be normal.

      OK
      Voltage alternates between high and low voltage.

    NG

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    OK

    REPLACE TIRE PRESSURE MONITOR INITIATOR DRIVER Click here